package Work;
//计算1/1-1/2+1/3-1/4+1/5 …… + 1/99 - 1/100 的值    。
public class Test11 {
    public static void main(String[] args) {
        double sum = 0.0;
        int flag = 1;
        for (int i = 1; i <= 100 ; i++) {
            sum += flag*(1.0/i);
            flag =- flag;
        }
        System.out.println(sum);
    }
}
